updated 6/20/2007 4:47:55 PM ET 2007-06-20T20:47:55

An armed security guard at Walter Reed Army Medical Center opened fire at another guard Wednesday outside a busy entrance to the hospital, police said. No one was injured.

The guards had been arguing at about 8:30 a.m. when one of them fired as many as 10 shots, Lt. Jimmie Riley said.

The other guard, who was not hit, ran to a nearby house to call police, Riley said. The guard who fired the shots was taken into custody.

“We’re very fortunate,” Riley said. “It could’ve been tragic.”

The guards are employed by a private security firm, which is under contract to Walter Reed.

Police did not immediately release the identities of the guards.

The hospital in Washington is the Army’s premier center for treating injured soldiers returning from Iraq and Afghanistan.

Copyright 2007 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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